Imperial Japanese “War Tubas”
Acoustic location devices became popular during WWI for use in locating incoming zeppelins and slow-moving aircraft. By the 1930’s, when these photos were taken, such devices could not keep up faster-moving aircraft. Until the adoption of radar on a wider scale in the late 30’s / early 1940’s, however, the devices would be kept in service with a number of militaries around the world.
It speaks to the endless military expense and obsolescence. It looks like a waste, but you pay a heavy price for not staying in the game.
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